CN112897643A - Reverse osmosis seawater desalination device based on graphene oxide separation membrane and desalination method thereof - Google Patents
Reverse osmosis seawater desalination device based on graphene oxide separation membrane and desalination method thereof Download PDFInfo
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- CN112897643A CN112897643A CN202110130567.0A CN202110130567A CN112897643A CN 112897643 A CN112897643 A CN 112897643A CN 202110130567 A CN202110130567 A CN 202110130567A CN 112897643 A CN112897643 A CN 112897643A
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- graphene oxide
- separation membrane
- reverse osmosis
- oxide separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a reverse osmosis seawater desalination device based on a graphene oxide separation membrane and a desalination method thereof, and belongs to the field of separation membrane water treatment. According to the reverse osmosis seawater desalination device based on the graphene oxide separation membrane and the desalination method thereof, the inner tube is of the outer square structure, the graphene oxide separation membrane can be directly paved on the outer surface without being bent when being installed, the mechanical strength reduction and the membrane structure damage caused by membrane bending are avoided, and the pressure bearing capacity and the service life of the reverse osmosis membrane can be ensured; meanwhile, the number of the small permeation holes arranged on the inner pipe is large, so that the permeable membrane area in unit volume is increased, and the high yield of the device is ensured.
Description
Technical Field
The invention belongs to the field of separation membrane water treatment, and particularly relates to a reverse osmosis seawater desalination device based on a graphene oxide separation membrane and a desalination method thereof.
Background
The separation membrane plays a key role in the membrane-assisted water treatment process and determines the economic benefit of the technology. Separation membrane technology is currently considered to be the most dominant membrane assisted desalination technology and process, and significant progress is constantly being made due to its effective desalination efficiency and reasonable energy consumption. Reverse osmosis represents the mainstream development direction of desalination technology in the future due to the advantages of low investment cost and low energy consumption of water production, and the technical progress of reverse osmosis depends on the development of membrane separation technology. The development of the separation membrane which has high specific surface area, high permeability, high selectivity, high chemical stability, good anti-pollution performance, low cost and large-area preparation inevitably brings huge economic benefits and has profound significance.
The graphene oxide separation membrane has high water permeability and high ion rejection rate, but is difficult to realize large-area and difficult to curl, so a reverse osmosis seawater desalination device is required to realize large-scale application.
Disclosure of Invention
The invention aims to overcome the defect that a graphene oxide membrane is not suitable for the conventional reverse osmosis seawater desalination device due to the fact that the graphene oxide membrane is not easy to curl, and provides a reverse osmosis seawater desalination device based on a graphene oxide separation membrane and a desalination method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a reverse osmosis seawater desalination device based on a graphene oxide separation membrane comprises an outer tube, an inner tube and end covers positioned at two ends of the outer tube;
the outer part of the inner tube is in a polygon prism shape, a plurality of small permeation holes communicated with the inner part are formed in the inner tube, and a graphene oxide separation membrane is arranged on the periphery of the inner tube;
one end cover is provided with a water inlet, the water inlet corresponds to the space between the inner pipe and the outer pipe, the other end cover is provided with a purified water outlet and a wastewater outlet, the purified water outlet corresponds to the inner pipe, and the wastewater outlet corresponds to the space between the inner pipe and the outer pipe.
Further, the graphene oxide separation membrane is prepared by the following preparation method:
the GO-PCTE composite film is prepared by using graphene oxide dispersion liquid as a raw material and a polycarbonate film as a substrate filter film through a vacuum filtration method and is used as a graphene oxide separation film.
Further, the thickness of the graphene oxide separation membrane is 8-14 μm.
Furthermore, the end cover and the outer pipe are connected through threads.
Further, rubber is used for sealing between the end cover and the outer pipe.
Further, the cross section of the inner flow passage of the inner pipe is circular.
The desalination method of the reverse osmosis seawater desalination device comprises the following steps:
when the feed liquid flows in from the water inlet of the end cover, a part of the feed liquid flows through the surface of the graphene oxide separation membrane along the direction parallel to the inner pipe and flows out from the wastewater outlet to form trapped concentrated liquid;
and a part of feed liquid flows into the inner pipe from the periphery of the inner pipe through the graphene oxide separation membrane and flows out from the purified water outlet.
Compared with the prior art, the invention has the following beneficial effects:
according to the reverse osmosis seawater desalination device based on the graphene oxide separation membrane and the desalination method thereof, the inner tube is of the outer square structure, the graphene oxide separation membrane can be directly paved on the outer surface without being bent when being installed, the mechanical strength reduction and the membrane structure damage caused by membrane bending are avoided, and the pressure bearing capacity and the service life of the reverse osmosis membrane can be ensured; meanwhile, the number of the small permeation holes 4 arranged on the inner pipe is large, so that the permeable membrane area in unit volume is increased, and the high yield of the device is ensured.
Furthermore, the thickness of the GO-PCTE composite film is 8-14 mu m, the permeability is correspondingly increased due to the great reduction of the film thickness, the thickness can be 3-5 orders of magnitude higher than that of a commercial film to the maximum extent, the total energy consumption of the device and the total number of the film components can be greatly reduced, the initial investment and the operation cost can be saved, and the economic benefit is remarkable.
Drawings
FIG. 1 is a schematic structural diagram of a seawater desalination plant according to the present invention;
FIG. 2 is a schematic structural view of a cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of the working system of the seawater desalination apparatus of the present invention.
Wherein: 1-an outer tube; 2-inner tube; 3-end cover; 4-infiltrating pores; 5-a water inlet; 6-a purified water outlet; 7-wastewater outlet.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The graphene oxide separation membrane which is newly developed but is still in a laboratory test stage is applied to a small-sized seawater desalination device, and the practical application of the graphene oxide membrane in the field of seawater desalination is promoted. The graphene oxide separation membrane has high water permeability and high ion rejection rate, but is difficult to realize large-area and difficult to curl, so a special reverse osmosis seawater desalination device is needed to realize large-scale application. The invention mainly aims to design a reverse osmosis seawater desalination device based on a graphene oxide film separation membrane, the reverse osmosis seawater desalination device is designed based on the principle of a spiral-wound membrane module, and the reverse osmosis treatment is carried out after seawater is pressurized by a high-pressure pump. The invention has the innovation points that the prepared reverse osmosis membrane and the independently designed device structure are adopted; the reverse osmosis membrane is a graphene oxide film or a porous graphene oxide film based on graphene oxide; the membrane module adopts a roll type, the structure is compact, the outer side and the inner side of the inner tube are square, the membrane is prevented from being bent, the number of the supporting holes is large, the water yield is large, and the recovery rate is high. The invention has important promotion effect on developing high-efficiency compact seawater desalination reverse osmosis technology.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a schematic structural diagram of a reverse osmosis seawater desalination device based on a graphene oxide separation membrane, and the reverse osmosis seawater desalination device comprises an outer tube 1, an inner tube 2 and end covers 3 positioned at two ends of the outer tube 1, wherein the outer side and the inner side of the inner tube 2 are square, the graphene oxide separation membrane is arranged on the inner tube 2, and a plurality of small permeation holes 4 communicated with the inner portion are circumferentially arranged on the inner tube 2; one end cover 3 is provided with a water inlet 5, the water inlet 5 is arranged corresponding to the space between the inner pipe 2 and the outer pipe 1, the other end cover 3 is provided with a purified water outlet 6 and a waste water outlet 7, the purified water outlet 6 is arranged corresponding to the inner pipe 2, and the waste water outlet 7 is arranged corresponding to the space between the inner pipe 2 and the outer pipe 1; the end cap 3 is screwed to the outer tube 1 and sealed with rubber.
The inner pipe 2 is of an outer square and inner round structure, as shown in figure 2, the inner pipe is directly paved on the outer surface without bending when a membrane is installed, so that the mechanical strength reduction and the membrane structure damage caused by membrane bending are avoided, and the bearing capacity and the service life of the reverse osmosis membrane can be ensured; meanwhile, the number of the small permeation holes 4 arranged on the inner pipe 2 is large, so that the permeable membrane area in unit volume is increased, and the high water yield of the device is ensured.
A reverse osmosis membrane of a core component adopts a vacuum filtration method, GO dispersion liquid with gradient concentration is used, a polycarbonate membrane (PCTE) is used as a substrate filter membrane, GO-PCTE composite membranes with different thicknesses are prepared, and the thickness is between 8 and 14 mu m. The membrane thickness is greatly reduced, the permeability is correspondingly increased, the membrane thickness can be 3-5 orders of magnitude higher than that of a commercial membrane to the maximum extent, the total energy consumption of the device and the total quantity of membrane components can be greatly reduced, the initial investment and the operation cost are saved, and the economic benefit is remarkable.
During the use, will tailor suitable oxidation graphite alkene separation membrane and fully wet earlier and be fixed in foraminiferous square inner tube 2 outer wall on, then pass through threaded connection with inner tube 2 and outer tube 1, use the rubber circle sealed.
Referring to fig. 3, fig. 3 is a schematic diagram of a working system of a roll-type seawater desalination plant, wherein a feed liquid pressurized by a high-pressure pump flows in from a water inlet 5 of a first end cover 3, a part of the feed liquid flows across from the surface of a membrane along a direction parallel to an inner pipe 2, and flows out from a wastewater outlet 7 to form a trapped concentrated solution; and a part of feed liquid flows into the inner pipe 2 from the fresh water which permeates the membrane around the inner pipe 2 and flows out from the purified water outlet 6. The component has compact structure, is convenient for realizing the miniaturization and integration of the device, and has low manufacturing cost and energy consumption.
In use, care needs to be taken in the case of reverse osmosis graphene oxide membranes. Under the good condition of membrane state, the device can normally operate, when the membrane produces the damage because of pressure and velocity of flow, need in time to cut off the confession liquid, the liquid in the exhaust device, the separation inside and outside pipe 1 clears away damaged membrane, changes the new membrane.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. A reverse osmosis seawater desalination device based on a graphene oxide separation membrane is characterized by comprising an outer pipe (1), an inner pipe (2) and end covers (3) positioned at two ends of the outer pipe;
the outer part of the inner pipe (2) is in a polygon prism shape, a plurality of small permeation holes (4) communicated with the inner part are formed in the inner pipe (2), and a graphene oxide separation membrane is arranged on the periphery of the inner pipe (2);
be equipped with water inlet (5) on one end cover, water inlet (5) correspond the space setting between inner tube (2) and outer tube (1), are equipped with water purification delivery port (6) and waste water delivery port (7) on another end cover, and water purification delivery port (6) correspond inner tube (2) and set up, and waste water delivery port (7) correspond the space setting between inner tube (2) and outer tube (1).
2. The reverse osmosis seawater desalination plant based on the graphene oxide separation membrane according to claim 1, wherein the graphene oxide separation membrane is prepared by the following preparation method:
the GO-PCTE composite film is prepared by using graphene oxide dispersion liquid as a raw material and a polycarbonate film as a substrate filter film through a vacuum filtration method and is used as a graphene oxide separation film.
3. A reverse osmosis seawater desalination plant based on a graphene oxide separation membrane according to claim 2 wherein the graphene oxide separation membrane has a thickness of 8-14 μm.
4. A reverse osmosis seawater desalination device based on a graphene oxide separation membrane according to claim 1, characterized in that the end cover (3) is connected with the outer pipe (1) through threads.
5. A reverse osmosis seawater desalination plant based on a graphene oxide separation membrane according to claim 4, characterized in that rubber sealing is used between the end cap (3) and the outer pipe (1).
6. A reverse osmosis seawater desalination plant based on graphene oxide separation membrane according to claim 1, characterized in that the cross section of the inner flow channel of the inner pipe (2) is circular.
7. A method of desalinating a reverse osmosis seawater desalination plant according to claims 1-6, wherein:
when the feed liquid flows in from a water inlet (5) of the end cover, a part of the feed liquid flows through the surface of the graphene oxide separation membrane along the direction parallel to the inner pipe (2) and flows out from a wastewater outlet (7) to form trapped concentrated liquid;
and a part of feed liquid flows into the inner pipe (2) from the periphery of the inner pipe (2) through the graphene oxide separation membrane and flows out through the purified water outlet (6).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116282379A (en) * | 2023-03-24 | 2023-06-23 | 浙江大学 | Ion micro-nano screening desalination method for agricultural water |
| CN116282379B (en) * | 2023-03-24 | 2024-05-31 | 浙江大学 | Ion micro-nano screening desalination method for agricultural water |
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| CN116282379A (en) * | 2023-03-24 | 2023-06-23 | 浙江大学 | Ion micro-nano screening desalination method for agricultural water |
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